Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
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Canton's Phosphorus
Put cal-ature to 140°, add 10 pounds potato or other cined oyster shells in layers, alternately with sulphur, and heat strongly in a covered crucible for an hour. This is also luminous in the dark after exposure to the sun.